zlacker

Although telcos are supposed to update the central equipment database (LERG) tables, not all of them do, or do it reliably. So if the LERG says such and such office has a Strowger or a DMS 10, it need not be true.

Ironically, now that Microsoft have killed off Metaswitch, and the Chinese vendors are banned, Ribbon (who own the Nortel assets) are probably the only game left in town. But I'm not sure there is much appetite or money among telcos to do a mass migration, meaning more and more gear will be left to rust in place.

>>kjells+(OP)
Very little money in it - POTS has been a dead end for a long time. The only thing keeping it alive is regulatory demands, and those have been steadily losing enforcement because only rare edge cases still care.